The primary difference between active transport and facilitated diffusion is that active transport is the only one in which
A) [S]high ? [S]low.
B) transporter proteins are required.
C) [S]low ? [S]high.
D) the concentration gradient provides the necessary energy for movement.
E) only water molecules move.
C) [S]low ? [S]high.
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The male pine cone
(a) produces pollen. (b) contains a female gametophyte. (c) bears a megasporangium containing a megaspore mother cell. (d) gives rise to a seed.
Methane, which is composed of carbon and hydrogen, lacks functional groups and is a gas at room
temperature. Upon replacing one of the hydrogen atoms with a hydroxyl group, methane is converted to methanol, which is a liquid at room temperature. Explain the reason behind this difference in physical properties.What will be an ideal response?
As replication proceeds in a prokaryotic cell, how many replication forks exist on one chromosome?
A) 1 B) 2 C) 3 D) 4 E) 5
Essential amino acids are amino acids that cannot be synthesized by an organism and so must be provided as nutrients.
Answer the following statement true (T) or false (F)